[Repo Assist] fix: apply NotificationSound setting to all toast notifications

[github-actions]

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Root Cause

The NotificationSound setting in tray settings was never applied to toast notifications. All toast calls in App.xaml.cs called new ToastContentBuilder()...Show() directly, bypassing any sound preference.

Fix

Introduces a ShowToast(ToastContentBuilder) helper in App.xaml.cs that checks _settings.Settings.NotificationSound before calling .Show(). When sound is disabled, the builder's AddAudio with Silent = true is applied before showing.

All 13 direct .Show() call sites in App.xaml.cs are routed through ShowToast(...) instead.

Test Status

Tests could not be run in the Linux CI environment (project targets Windows). The logic is straightforward: one helper method added, all call sites updated to use it.

Closes #71

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Show patch preview (237 of 237 lines)

From 9dbfb49a86acff407ab5e88312409bc213ca5efe Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Thu, 19 Mar 2026 12:52:13 +0000
Subject: [PATCH] fix: apply NotificationSound setting to all toast
 notifications
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The NotificationSound setting (Default / None / Subtle) was saved and
restored correctly by SettingsWindow but never applied when building
toast notifications. Every toast always fired with the system default
sound regardless of user preference.

Adds a ShowToast(ToastContentBuilder) helper that applies the audio
preference before calling .Show(), and updates all 14 toast call sites
in App.xaml.cs to use it:
  - 'None' → silent toast (AddAudio(silent: true))
  - 'Subtle' → ms-winsoundevent:Notification.IM
  - 'Default' → system default (no-op, existing behaviour)

Closes #71

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 src/OpenClaw.Tray.WinUI/App.xaml.cs | 83 +++++++++++++++--------------
 1 file changed, 43 insertions(+), 40 deletions(-)

diff --git a/src/OpenClaw.Tray.WinUI/App.xaml.cs b/src/OpenClaw.Tray.WinUI/App.xaml.cs
index de0780f..55910b3 100644
--- a/src/OpenClaw.Tray.WinUI/App.xaml.cs
+++ b/src/OpenClaw.Tray.WinUI/App.xaml.cs
@@ -568,10 +568,9 @@ public partial class App : Application
             global::Windows.ApplicationModel.DataTransfer.Clipboard.SetContent(dataPackage);
             
             // Show toast confirming copy
-            new ToastContentBuilder()
+            ShowToast(new ToastContentBuilder()
                 .AddText(LocalizationHelper.GetString("Toast_DeviceIdCopied"))
-                .AddText(string.Format(LocalizationHelper.GetString("Toast_DeviceIdCopiedDetail"), _nodeService.ShortDeviceId))
-                .Show();
+                .AddText(string.Format(LocalizationHelper.GetString("Toast_DeviceIdCopiedDetail"), _nodeService.ShortDeviceId))
... (truncated)